Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (9,321)	$ (25,562)
Other comprehensive (loss) income, net of income tax:
Unrealized gain on available-for-sale securities	1,361	779
Foreign currency translation adjustments	473	(2,006)
Other comprehensive income (loss)	1,834	(1,227)
Total comprehensive loss	$ (7,487)	$ (26,789)